pinMode changes mode on subsequent Neopixel write() in 2v00 causing Green first Neo in WS2812b strip

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Robin
Older Espruino version first Green Neopixel anomaly update

Wed 2019.01.23 four hours later

Curiosity got the better of me and I reflashed to an older version.

And as I expected, the first Neo Green anomaly goes away! The first Neo never illuminates Green. This is as expected.

So, confirmed, there is something different for hardware SPI on a Pico (in this case 1V94 which works) in older versions, compared to 2V00 which causes the false first Green Neopixel in a WS2812b string.

I tried to get as close to 1V93 and 1V99 using the running list, but this was as close as I could locate

http://www.espruino.com/binaries/travis/54240e92f74840e9eccfbec431e2c3ae9951ae63/espruino_1v94.22_pico_1r3.bin
```
  "VERSION": "1v94.22",
  "BUILD_DATE": "Aug 30 2017",
  "BUILD_TIME": "23:02:10",
  "GIT_COMMIT": "54240e92f74840e9eccfbec431e2c3ae9951ae63",
  "BOARD": "PICO_R1_3",
```
When first powering the board, this is the default mode

getPinMode(B15)
="analog"

And confirmed as suggested in #3 does switch after a code 'send' is performed

getPinMode(B15)
="af_output"

No pull-up used in data line as both devices at 5V

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